Hey Arni:),
Great to see somebody try his hands on such a great aircraft! And you did a pretty good job! The size of your model is impressive, however way too large for minifig scale I believe (Hint: I wouldn't go by the width of minifigs nor seats per row or seat numbers in general - rather go by the height of the fig as a key dimension to make things look right in size).The nose's side profile actually looks pretty good to me! What you may do to get a nice front profile of the nose is: use various kind of slopes (differently angled ones) & also incorporate them mounted sideways. It's amazing what you can do then, imitating round or oval curves...
For a large Lego aircraft's wings with four engines placed far away from the fuselage (like on a 747), it is best to use steeply angled plates and shift them. That way, you can make dihedral wings (rising up)and let the wings get thinner and thinner towards their tips...Anyways, I hope those tips may help a little on future models. Best regards, Steffen

Nice build, it's really cool how you get the real interiors of the aircraft you make :). My only critic would be the front of the aircraft could be worked up on a bit, but it's still great as I find the 747 nose section the hardest lego aircraft related thing to make (which is why I long gave up trying as mine looked terrible, while yours works :D). Anyway, congrats, really great creation, can't wait to see more :)